حَدَّثَنَا ابْنُ إِدْرِيسَ أَنْبَأَنَا ابْنُ جُرَيْجٍ عَنِ ابْنِ أَبِي عَمَّارٍ عَنْ عَبْدِ اللَّهِ بْنِ بَابَيْهِ عَنْ يَعْلَى بْنِ أُمَيَّةَ قَالَ سَأَلْتُ عُمَرَ بْنَ الْخَطَّابِ قُلْتُ لَيْسَ عَلَيْكُمْ جُنَاحٌ أَنْ تَقْصُرُوا مِنْ الصَّلَاةِ إِنْ خِفْتُمْ أَنْ يَفْتِنَكُمْ الَّذِينَ كَفَرُوا وَقَدْ أَمَّنَ اللَّهُ النَّاسَ فَقَالَ لِي عُمَرُ عَجِبْتُ مِمَّا عَجِبْتَ مِنْهُ فَسَأَلْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنْ ذَلِكَ فَقَالَ صَدَقَةٌ تَصَدَّقَ اللَّهُ بِهَا عَلَيْكُمْ فَاقْبَلُوا صَدَقَتَهُ
مسند امام احمد بن حنبل · Hadith 174
It was narrated that Ya'la bin Umayyah said: i said to 'Umar bin al-Khattab "And when you (Muslims) travel in the land, there is no sin on you if you shorten As-Salah (the prayer) if you fear that the disbelievers may put you in trial (attack you)" [an-Nisa' 4:101]. But now the people are safe. He said: I wondered the same thing as you are wondering, and I asked the Messenger of Allah about that. He said: "It is a charity that Allah has bestowed upon you, so accept His charity."
Sanad
حَدَّثَنَا ابْنُ إِدْرِيسَ أَنْبَأَنَا ابْنُ جُرَيْجٍ عَنِ ابْنِ أَبِي عَمَّارٍ عَنْ عَبْدِ اللَّهِ بْنِ بَابَيْهِ عَنْ يَعْلَى بْنِ أُمَيَّةَ